Quarterly report pursuant to Section 13 or 15(d)

Nature of Operations and Summary of Significant Accounting Policies - Clinics in Operation Under Franchise Agreements or Company-owned or Managed (Details)

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Nature of Operations and Summary of Significant Accounting Policies - Clinics in Operation Under Franchise Agreements or Company-owned or Managed (Details)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2020
clinic
Mar. 31, 2019
Jun. 30, 2018
Clinics in operation at the end of the period 530 454        
Closed during the period 0 1        
Number of Stores 530 454 530   454  
Clinic licenses sold but not yet developed     176   145  
Executed letters of intent for future clinic licenses     36   27  
Franchised Clinics            
Clinics open at beginning of period 453          
Opened during the period 16 12        
Sold during the period 0 1        
Clinics in operation at the end of the period 469 404        
Opened during the period 16 12        
Closed during the period 0 (1)        
Number of Stores 469 404 469 469 404 394
Company-owned or Managed Clinics            
Clinics open at beginning of period 60          
Opened during the period 1 2        
Clinics in operation at the end of the period 61 50        
Opened during the period 1 2        
Acquired during the period 0 1        
Number of Stores 61 50 61 61 50 48